<!-- 一级分类跳转页面 -->
<template>
  <div class="top-category">
    <div class="container">
      <!-- 面包屑 -->
      <XtxBread>
        <XtxBreadItem :to="{path: '/'}">首页</XtxBreadItem>
        <transition name="fade-right" mode="out-in">
          <XtxBreadItem :key="category.id" v-if="category">{{category.name}}</XtxBreadItem>
        </transition>
      </XtxBread>
      <!-- 轮播图 --> 
      <XtxCarousel :sliders="sliders" style="height:500px" />
      <!-- 全部分类 -->
      <div class="sub-list" v-if="category && category.children">
        <h3>全部分类</h3>
        <ul>
          <li v-for="sub in category.children" :key="sub.id">
            <a href="javascript:;">
              <img :src="sub.picture" >
              <p>{{sub.name}}</p>
            </a>
          </li>
        </ul>
      </div>
      <!-- 各个分类推荐商品 -->
      <div class="ref-goods" v-for="sub in subList" :key="sub.id">
        <div class="head">
          <h3>- {{sub.name}} -</h3>
          <p class="tag">温暖柔软，品质之选</p>
          <XtxMore :path="`/category/sub/${sub.id}`"/>
        </div>
        <div class="body">
          <GoodsItem v-for="goods in sub.goods" :key="goods.id" :goods="goods"/>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {computed, ref, watch} from 'vue'
import {findBanner} from '@/api/home'
import { useStore } from 'vuex'
import { useRoute } from 'vue-router'
import GoodsItem from './components/goods_item.vue'
import {findTopCategory} from '@/api/category'
export default {
    name: 'TopCategory',
    components: {GoodsItem},
    setup () {
      //获取轮播图数据
      const sliders = ref([])
        findBanner ().then(data => {
            sliders.value = data.result
        })

      //面包屑数据
      const store = useStore()
      const route = useRoute()
      const category = computed(() => {
        let cate = {}
        const item = store.state.category.list.find(item => {
          //route.params.id路由id
          return item.id === route.params.id
        })
        // 找到数据赋值
        if (item) cate = item
        return cate
      })
      
      // 各个分类推荐商品数据
      const subList = ref([])
      const getSubList = () => {
        findTopCategory(route.params.id).then(data => {
        subList.value = data.result.children
        })
      } 
      watch (() => route.params.id, (newValue) => {
        // newValue && getSubList()
        // 严谨判断
        if(newValue && `/category/${newValue}` === route.path) getSubList()
      }, {immediate: true})
        return {sliders, category, subList}
    }
}
</script>

<style lang="less" scoped>

.top-category {
  h3 {
    font-size: 28px;
    color: #666;
    font-weight: normal;
    text-align: center;
    line-height: 100px;
  }
  .sub-list {
    margin-top: 20px;
    background-color: #fff;
    ul {
      display: flex;
      padding: 0 32px;
      flex-wrap: wrap;
      min-height: 160px;
      li {
        width: 168px;
        height: 160px;
        a {
          text-align: center;
          display: block;
          font-size: 16px;
          img {
            width: 100px;
            height: 100px;
          }
          p {
            line-height: 40px;
          }
          &:hover {
            color: @xtxColor;
          }
        }
      }
    }
  }
  // 推荐商品
  .ref-goods {
    background-color: #fff;
    margin-top: 20px;
    position: relative;
    .head {
      .xtx-more {
        position: absolute;
        top: 20px;
        right: 20px;
      }
      .tag {
        text-align: center;
        color: #999;
        font-size: 20px;
        position: relative;
        top: -20px;
      }
    }
    .body {
      display: flex;
      justify-content: flex-start;
      flex-wrap: wrap;
      padding: 0 65px 30px;
    }
  }
}

</style>